blob: 8b81076b247fa585d316bb5273089987e7b18201 [file] [log] [blame]
// Copyright (c) 2015, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
import 'dart:async';
import '../typed/future.dart';
/// A wrapper that forwards calls to a [Future].
class DelegatingFuture<T> implements Future<T> {
/// The wrapped [Future].
final Future<T> _future;
/// Creates a wrapper which throws if [future]'s value isn't an instance of
/// `T`.
/// This soundly converts a [Future] to a `Future<T>`, regardless of its
/// original generic type, by asserting that its value is an instance of `T`
/// whenever it's provided. If it's not, the future throws a [CastError].
static Future/*<T>*/ typed/*<T>*/(Future future) =>
future is Future/*<T>*/ ? future : new TypeSafeFuture/*<T>*/(future);
Stream<T> asStream() => _future.asStream();
Future<T> catchError(Function onError, {bool test(Object error)}) =>
_future.catchError(onError, test: test);
Future/*<S>*/ then/*<S>*/(/*=S*/ onValue(T value), {Function onError}) =>
_future.then(onValue, onError: onError);
Future<T> whenComplete(action()) => _future.whenComplete(action);
Future<T> timeout(Duration timeLimit, {onTimeout()}) =>
_future.timeout(timeLimit, onTimeout: onTimeout);